My NRI TV with a Space Phone from the Future
By the early 1980s, my journey through electronics was ready for a structured map. While my early days as Star Child were fueled by pure curiosity and the chaotic skip signals of the CB craze, I wanted a deeper mastery of the circuitry beneath the wood-grain cabinets. This led me to enroll in the National Radio Institute's master correspondence course, operating under the heavy corporate wing of McGraw-Hill.
The National Radio Institute Curriculum
The foundation of my formal component-level electronics training: the original master correspondence course binders and loose-leaf instructional booklets from the National Radio Institute (McGraw-Hill). Working through these heavily detailed theoretical manuals established the structured road map for my technical education.
The road to my final National Radio Institute diploma wasn't a straight, fast sprint; it was a slow burn that spanned major transitions in my life. When I separated from the Active Army in 1984, my primary focus shifted immediately to my degree courses at Ferris State College. The NRI manuals were there, but they sat on the back burner, a slow-and-steady companion to my university workload. It wasn't until I finished at Ferris and moved back into my parents' house that the momentum truly shifted. Suddenly, the theory phase was over, and the heavy hardware began to arrive.
Every few weeks, the arrival of a massive, heavy cardboard box from Washington, D.C., turned my workspace into a high-stakes engineering lab. Unlike modern online learning where everything happens on a glass screen, NRI’s "50-50" method demanded that you build the very tools you needed to pass the class. Slowly, a matching family of slate-gray and dark-charcoal metal cabinets began to dominate my workbench, forming what I think of as the holy trinity of my student days.
The first piece was the CONAR Model 255 Oscilloscope. With its compact chassis and lower vertical bandwidth, it was a modest recurrent-sweep scope perfectly suited for a student trying to visually demystify the audio spectrum for the first time. Right alongside it sat the matching CONAR Model 280 Signal Generator. To find a dead spot or an "open" in a silent circuit, I would set the generator to punch its steady, internal 400 Hz audio tone straight into the stages of an amplifier, tracing the signal backward until the silence finally broke into a loud buzz.
But the absolute centerpiece of that diagnostic lineup was sitting quietly right under my current workbench all along: my CONAR Model 224 Tube Tester. For years, I had a lingering memory of spinning a backlit paper roll chart behind a clear glass window to look up tube settings. But pulling the physical Model 224 out of the cabinet decades later solved the mystery. CONAR had actually updated the 224, doing away with the mechanical drum of the older 223 models. Instead, it relied on a separate, loose-leaf printed data booklet—a piece of paper long since lost to time. Fortunately, digital archaeology saved the day. A quick search on my Mac unearthed a 50-page PDF duplicate of that exact data manual. Looking at the aluminum faceplate today, I can still perfectly see the architecture of my training: the line adjustment knob, the 10 legacy sockets waiting for everything from an old octal to a 12-pin Compactron, and that row of 12 distinct toggle switches across the bottom that routed the currents. Holding down the "Read Meter" button and watching that large, colorful analog needle swing into the "GOOD" or "REPLACE" zone was the ultimate validation of a student’s precision.
The CONAR Student Test Bench
The hands-on, kit-built diagnostic tools assembled during my coursework: the CONAR Model 255 recurrent-sweep oscilloscope and the updated CONAR Model 224 tube tester. Assembled from individual components, these blue instruments provided the essential voltage tracking and vacuum tube diagnostic capabilities required to analyze high-voltage television circuitry.
Armed with that slate-gray trio, I was finally ready for the final project. But nothing quite prepared me for the sheer scale of the kit. When the delivery truck pulled up to my parents' house, I was genuinely startled by the size of the boxes. They were massive, heavy, and incredibly awkward to wrestle through the front door. Unpacking the components felt less like starting a school lesson and more like launching a major construction project. Because of its sheer size, a dedicated workbench wouldn't cut it. The assembly completely took over our family living room, with parts, circuit boards, and bundles of wire sprawling across the carpet.
Building a television of that scale isn’t just a visual or tactile experience—it imprints itself on your senses. Decades later, if I close my eyes, I can still vividly recall the distinct odors that filled our living room as the assembly progressed. Chief among them was the scent of melting solder flux. I kept a small tin of soldering paste on hand. Before bringing the iron to a joint, I would dab a bit of the paste onto the circuit board traces where the legs of the capacitors, resistors, and coils poked through. The moment the hot tip touched the metal, the paste would hiss and dissolve into a thin liquid flux. In theory, it was there to evenly distribute the intense heat of the iron, clean the metal, and guarantee a flawless, permanent connection. In reality, it also filled the room with a sharp, heavy, resinous aroma that, to me, smelled exactly like progress.
Before the ultimate "first light" moment when the whole machine came together, there was a long series of smaller, quieter victories. The Zenith/Heathkit assembly manual was structured like an epic novel, broken down into distinct, technical chapters. Each time I leaned back from the iron and wiped the flux residue from my hands, I would look down at a newly populated section of the chassis and realize I had just conquered a major organ of the television's anatomy. I was building a complex highway for signals. There was the RF Tuner and Mixer designed to grab the invisible waves from the air, followed by the Video Intermediate Frequency (VIF) Amplifier and Video Detector to strip away the carrier waves. Step by step, I assembled the Video Output Amplifier to feed the massive CRT picture tube, alongside the intricate Sync Separator that kept the picture from rolling. Then came the heavy-duty engineering of the Vertical and Horizontal Deflection Circuits, culminating in the thick, heavily insulated wires of the high-voltage Flyback Transformer. Then came the audio path: the Sound IF Amplifier, the Audio Detector/Demodulator, and the Audio Power Amplifier to drive the console's speakers. And finally, sitting right alongside all that classic television geometry, was the wildest circuit block of them all—the Jetsons-esque telecommunications board for the "Space Phone," an early smart-TV precursor that allowed you to run your landline telephone right through the television chassis.
As the chassis neared completion, the sheer scale of what I was doing began to sink in. Populating low-voltage audio circuit boards was one thing, but assembling the high-voltage horizontal deflection circuit and wiring up the Flyback Transformer gave me serious pause. I stared down at the massive glass envelope of the CRT picture tube, realizing that bringing it to life required generating upwards of 25,000 to 30,000 volts. A sudden wave of imposter syndrome hit me right there in the living room. What am I doing here? I must be crazy. I slowed my pace to an absolute crawl, meticulously checking every joint.
Then, the big day finally arrived. The chassis was complete, but it was sitting wide open on the floor without any sort of enclosure. Anxious to see if it worked, I braced myself and hit the power switch.
Nothing happened.
The television was completely, devastatingly dead. No static pop on the glass face, no filament glow, no audio hiss. It was the ultimate anticlimax. But as the initial wave of disappointment washed over me, my training took over. In a project comprising thousands of interconnected hand-soldered components, it was highly likely that a single, microscopic cold solder connection was sitting there acting as an open circuit. It took a few weeks of methodical tracing, checking voltages, and verifying paths with my trusty CONAR gear before I finally isolated the culprit. I carefully repaired the joint, and spent extra time going through the surrounding circuitry, double-checking adjacent connections to make absolutely sure no other phantom opens were left behind.
When the second big day arrived, I stood in front of the naked chassis, practically holding my breath, and pressed the power button once more.
Suddenly, the living room filled with a loud, heavy, metallic THUMP—followed by a deep, vibrating hum that slowly dissolved into a faint fade over a few seconds. The automatic degaussing coil wrapped around the giant glass CRT had just fired down, clearing the magnetic field. As that degaussing hum faded away, the glass screen began to glow. Even running on just a basic pair of indoor rabbit ears, a crisp, bright analog picture stabilized on the screen, accompanied by beautiful, clean sound. The wave of excitement that washed over me in that moment was absolutely amazing.
The Advanced Zenith System 3 Concept
An original vintage marketing spread showcasing the flagship Zenith System 3 chassis. Highlighting the state-of-the-art integration of television reception and home telephone hardware, this advanced engineering architecture formed the exact kit-built design underlying my final NRI master project.
Yet, I still had one glaring logistical problem to solve: I had a fully functional, high-voltage TV chassis sitting completely wide open on our living room floor. Something was going to have to be done about that. I looked behind the new chassis at the old TV sitting on the floor behind it. This new TV with the Space Phone of the future was slated to replace that old console, which my dad had built with his own hands years earlier and was beginning to fail from old age. I realized the old wooden console cabinet itself might hold the solution.
After carefully removing my dad's old TV from its housing, I slid my newly built NRI chassis inside. It was a little loose at first, but with some careful thought and a few small modifications, it locked securely into place. Everything looked like it completely belonged there. I had a brand new, high-tech television enclosed in a beautiful, sentimental wooden console cabinet right in our family living room. The project was officially complete, and my final NRI diploma arrived shortly after on July 4, 1987. I spent a long, quiet time just standing there in the living room, admiring exactly what I had accomplished.
The Completed "Space Phone" Showcase
A final hardware breakdown of the completed project: the main Zenith System 3 console chassis running the integrated Space Phone system, a close-up view of the flip-down master electronic control panel cluster hidden on the set, and the multi-button Computer Space Command remote control clicker unit. Retrofitted directly into my father's original wooden console cabinet housing, the resulting setup brought the ultimate 1980s smart-television hardware straight to our family living room.
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